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    模块化的好处
    <ul>
        <li>防止命名冲突</li>
        <li>代码复用</li>
        <li>高维护性</li>
    </ul>
    es6之前的模块化规范有：
    commonjs => nodejs browserify
    amd => requirejs
    cmd => seajs
    <!-- 浏览器的模块化规范有： -->



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